the only way i can think of is to trade with someone who has a mudkip.
For Ruby, Mudkip. For Sapphire, Treecko. For emerald I do not know
The starter Pokemon are Treecko,Torchic and Mudkip.
Treecko, Torchic, and Mudkip.
treecko mudkip and torchic
Torchic,Treecko and Mudkip
torchic,treecko and mudkip
Torchic, Treecko, Mudkip
at the pokemon lab
The best to start off as is mudkip as it is the strongest against the starting gyms.
treecko or mudkip
Torchic, Mudkip, and Treecko.
Treecko, Torchic and Mudkip.